<?php

declare(strict_types=1);

namespace App\Support\ReasonTranslation;

use App\Support\Baselines\BaselineCompareReasonCode;
use App\Support\Baselines\BaselineReasonCodes;
use App\Support\Operations\ExecutionDenialReasonCode;
use App\Support\Operations\LifecycleReconciliationReason;
use App\Support\Providers\ProviderReasonCodes;
use App\Support\Providers\ProviderReasonTranslator;
use App\Support\RbacReason;
use App\Support\Tenants\TenantOperabilityReasonCode;
use App\Support\Ui\OperatorExplanation\TrustworthinessLevel;

final class ReasonTranslator
{
    public const string EXECUTION_DENIAL_ARTIFACT = 'execution_denial_reason_code';

    public const string TENANT_OPERABILITY_ARTIFACT = 'tenant_operability_reason_code';

    public const string RBAC_ARTIFACT = 'rbac_reason';

    public const string GOVERNANCE_ARTIFACT_TRUTH_ARTIFACT = 'governance_artifact_truth_reason';

    public function __construct(
        private readonly ProviderReasonTranslator $providerReasonTranslator,
        private readonly FallbackReasonTranslator $fallbackReasonTranslator,
    ) {}

    /**
     * @param  array<string, mixed>  $context
     */
    public function translate(
        ?string $reasonCode,
        ?string $artifactKey = null,
        string $surface = 'detail',
        array $context = [],
    ): ?ReasonResolutionEnvelope {
        $reasonCode = is_string($reasonCode) ? trim($reasonCode) : '';

        if ($reasonCode === '') {
            return null;
        }

        return match (true) {
            $artifactKey === ProviderReasonTranslator::ARTIFACT_KEY,
            $artifactKey === null && $this->providerReasonTranslator->canTranslate($reasonCode) => $this->providerReasonTranslator->translate($reasonCode, $surface, $context),
            $artifactKey === self::GOVERNANCE_ARTIFACT_TRUTH_ARTIFACT && BaselineCompareReasonCode::tryFrom($reasonCode) instanceof BaselineCompareReasonCode => $this->translateBaselineCompareReason($reasonCode),
            $artifactKey === null && BaselineCompareReasonCode::tryFrom($reasonCode) instanceof BaselineCompareReasonCode => $this->translateBaselineCompareReason($reasonCode),
            $artifactKey === self::GOVERNANCE_ARTIFACT_TRUTH_ARTIFACT && BaselineReasonCodes::isKnown($reasonCode) => $this->translateBaselineReason($reasonCode),
            $artifactKey === null && BaselineReasonCodes::isKnown($reasonCode) => $this->translateBaselineReason($reasonCode),
            $artifactKey === self::EXECUTION_DENIAL_ARTIFACT,
            $artifactKey === null && ExecutionDenialReasonCode::tryFrom($reasonCode) instanceof ExecutionDenialReasonCode => ExecutionDenialReasonCode::tryFrom($reasonCode)?->toReasonResolutionEnvelope($surface, $context),
            $artifactKey === null && LifecycleReconciliationReason::tryFrom($reasonCode) instanceof LifecycleReconciliationReason => LifecycleReconciliationReason::tryFrom($reasonCode)?->toReasonResolutionEnvelope($surface, $context),
            $artifactKey === self::TENANT_OPERABILITY_ARTIFACT,
            $artifactKey === null && TenantOperabilityReasonCode::tryFrom($reasonCode) instanceof TenantOperabilityReasonCode => TenantOperabilityReasonCode::tryFrom($reasonCode)?->toReasonResolutionEnvelope($surface, $context),
            $artifactKey === self::RBAC_ARTIFACT,
            $artifactKey === null && RbacReason::tryFrom($reasonCode) instanceof RbacReason => RbacReason::tryFrom($reasonCode)?->toReasonResolutionEnvelope($surface, $context),
            $artifactKey === self::GOVERNANCE_ARTIFACT_TRUTH_ARTIFACT => $this->fallbackReasonTranslator->translate($reasonCode, $surface, $context),
            $artifactKey === null && ProviderReasonCodes::isKnown($reasonCode) => $this->providerReasonTranslator->translate($reasonCode, $surface, $context),
            default => $this->fallbackTranslate($reasonCode, $artifactKey, $surface, $context),
        };
    }

    /**
     * @param  array<string, mixed>  $context
     */
    private function fallbackTranslate(
        string $reasonCode,
        ?string $artifactKey,
        string $surface,
        array $context,
    ): ?ReasonResolutionEnvelope {
        if ($artifactKey === null) {
            $normalizedCode = \App\Support\OpsUx\RunFailureSanitizer::normalizeReasonCode($reasonCode);

            if ($normalizedCode !== $reasonCode) {
                return $this->translate($normalizedCode, null, $surface, $context + ['source_reason_code' => $reasonCode]);
            }
        }

        return $this->fallbackReasonTranslator->translate($reasonCode, $surface, $context);
    }

    private function translateBaselineReason(string $reasonCode): ReasonResolutionEnvelope
    {
        [$operatorLabel, $shortExplanation, $actionability, $nextStep] = match ($reasonCode) {
            BaselineReasonCodes::CAPTURE_MISSING_SOURCE_TENANT => [
                'Source tenant unavailable',
                'The selected tenant is not available in this workspace for baseline capture.',
                'prerequisite_missing',
                'Select a source tenant from the same workspace before capturing again.',
            ],
            BaselineReasonCodes::CAPTURE_PROFILE_NOT_ACTIVE => [
                'Baseline profile inactive',
                'Only active baseline profiles can be captured or compared.',
                'prerequisite_missing',
                'Activate the baseline profile before retrying this action.',
            ],
            BaselineReasonCodes::CAPTURE_ROLLOUT_DISABLED,
            BaselineReasonCodes::COMPARE_ROLLOUT_DISABLED => [
                'Full-content rollout disabled',
                'This workflow is disabled by rollout configuration in the current environment.',
                'prerequisite_missing',
                'Enable the rollout before retrying full-content baseline work.',
            ],
            BaselineReasonCodes::SNAPSHOT_BUILDING,
            BaselineReasonCodes::COMPARE_SNAPSHOT_BUILDING => [
                'Baseline still building',
                'The selected baseline snapshot is still building and cannot be trusted for compare yet.',
                'prerequisite_missing',
                'Wait for capture to finish or use the current complete snapshot instead.',
            ],
            BaselineReasonCodes::SNAPSHOT_INCOMPLETE,
            BaselineReasonCodes::COMPARE_SNAPSHOT_INCOMPLETE => [
                'Baseline snapshot incomplete',
                'The snapshot did not finish cleanly, so TenantPilot will not use it for compare.',
                'prerequisite_missing',
                'Capture a new baseline and wait for it to complete before comparing.',
            ],
            BaselineReasonCodes::SNAPSHOT_SUPERSEDED,
            BaselineReasonCodes::COMPARE_SNAPSHOT_SUPERSEDED => [
                'Snapshot superseded',
                'A newer complete baseline snapshot is current, so this historical snapshot is not compare input anymore.',
                'prerequisite_missing',
                'Use the current complete snapshot for compare instead of this historical copy.',
            ],
            BaselineReasonCodes::SNAPSHOT_CAPTURE_FAILED => [
                'Baseline capture failed',
                'Snapshot capture stopped after the row was created, so the artifact remains unusable.',
                'retryable_transient',
                'Review the run details, then retry the capture once the failure is addressed.',
            ],
            BaselineReasonCodes::SNAPSHOT_COMPLETION_PROOF_FAILED => [
                'Completion proof failed',
                'TenantPilot could not prove that every expected snapshot item was persisted successfully.',
                'prerequisite_missing',
                'Capture the baseline again so a complete snapshot can be finalized.',
            ],
            BaselineReasonCodes::SNAPSHOT_LEGACY_NO_PROOF => [
                'Legacy completion unproven',
                'This older snapshot has no reliable completion proof, so it is blocked from compare.',
                'prerequisite_missing',
                'Recapture the baseline to create a complete snapshot with explicit lifecycle proof.',
            ],
            BaselineReasonCodes::SNAPSHOT_LEGACY_CONTRADICTORY => [
                'Legacy completion contradictory',
                'Stored counts or producer-run evidence disagree, so TenantPilot treats this snapshot as incomplete.',
                'prerequisite_missing',
                'Recapture the baseline to replace this ambiguous historical snapshot.',
            ],
            BaselineReasonCodes::COMPARE_NO_ASSIGNMENT => [
                'No baseline assigned',
                'This tenant has no assigned baseline profile yet.',
                'prerequisite_missing',
                'Assign a baseline profile to the tenant before starting compare.',
            ],
            BaselineReasonCodes::COMPARE_PROFILE_NOT_ACTIVE => [
                'Assigned baseline inactive',
                'The assigned baseline profile is not active, so compare cannot start.',
                'prerequisite_missing',
                'Activate the assigned baseline profile or assign a different active profile.',
            ],
            BaselineReasonCodes::COMPARE_NO_ACTIVE_SNAPSHOT,
            BaselineReasonCodes::COMPARE_NO_CONSUMABLE_SNAPSHOT => [
                'Current baseline unavailable',
                'No complete baseline snapshot is currently available for compare.',
                'prerequisite_missing',
                'Capture a baseline and wait for it to complete before comparing.',
            ],
            BaselineReasonCodes::COMPARE_NO_ELIGIBLE_TARGET => [
                'No eligible compare target',
                'No assigned tenant with compare access is currently available for this baseline profile.',
                'prerequisite_missing',
                'Assign this baseline to a tenant you can compare, or use an account with access to an assigned tenant.',
            ],
            BaselineReasonCodes::COMPARE_INVALID_SNAPSHOT => [
                'Selected snapshot unavailable',
                'The requested baseline snapshot could not be found for this profile.',
                'prerequisite_missing',
                'Refresh the page and select a valid snapshot for this baseline profile.',
            ],
            default => [
                'Baseline workflow blocked',
                'TenantPilot recorded a baseline precondition that prevents this workflow from continuing safely.',
                'prerequisite_missing',
                'Review the recorded baseline state before retrying.',
            ],
        };

        return new ReasonResolutionEnvelope(
            internalCode: $reasonCode,
            operatorLabel: $operatorLabel,
            shortExplanation: $shortExplanation,
            actionability: $actionability,
            nextSteps: [
                NextStepOption::instruction($nextStep),
            ],
            diagnosticCodeLabel: $reasonCode,
            trustImpact: BaselineReasonCodes::trustImpact($reasonCode) ?? TrustworthinessLevel::Unusable->value,
            absencePattern: BaselineReasonCodes::absencePattern($reasonCode),
        );
    }

    private function translateBaselineCompareReason(string $reasonCode): ReasonResolutionEnvelope
    {
        $enum = BaselineCompareReasonCode::tryFrom($reasonCode);

        if (! $enum instanceof BaselineCompareReasonCode) {
            return $this->fallbackReasonTranslator->translate($reasonCode) ?? new ReasonResolutionEnvelope(
                internalCode: $reasonCode,
                operatorLabel: 'Baseline compare needs review',
                shortExplanation: 'TenantPilot recorded a baseline-compare state that needs operator review.',
                actionability: 'permanent_configuration',
            );
        }

        [$operatorLabel, $shortExplanation, $actionability, $nextStep] = match ($enum) {
            BaselineCompareReasonCode::NoDriftDetected => [
                'No drift detected',
                'The comparison completed for the in-scope subjects without recording drift findings.',
                'non_actionable',
                'No action needed unless you expected findings.',
            ],
            BaselineCompareReasonCode::CoverageUnproven => [
                'Coverage proof missing',
                'The comparison finished, but missing coverage proof means some findings may have been suppressed for safety.',
                'prerequisite_missing',
                'Run inventory sync and compare again before treating this as complete.',
            ],
            BaselineCompareReasonCode::EvidenceCaptureIncomplete => [
                'Evidence capture incomplete',
                'The comparison finished, but incomplete evidence capture limits how much confidence you should place in the visible result.',
                'prerequisite_missing',
                'Resume or rerun evidence capture before relying on this compare result.',
            ],
            BaselineCompareReasonCode::RolloutDisabled => [
                'Compare rollout disabled',
                'The comparison path was limited by rollout configuration, so the result is not decision-grade.',
                'prerequisite_missing',
                'Enable the rollout or use the supported compare mode before retrying.',
            ],
            BaselineCompareReasonCode::NoSubjectsInScope => [
                'Nothing was eligible to compare',
                'No in-scope subjects were available for evaluation, so the compare could not produce a normal result.',
                'prerequisite_missing',
                'Review scope selection and baseline inputs before comparing again.',
            ],
        };

        return new ReasonResolutionEnvelope(
            internalCode: $reasonCode,
            operatorLabel: $operatorLabel,
            shortExplanation: $shortExplanation,
            actionability: $actionability,
            nextSteps: [
                NextStepOption::instruction($nextStep),
            ],
            diagnosticCodeLabel: $reasonCode,
            trustImpact: $enum->trustworthinessLevel()->value,
            absencePattern: $enum->absencePattern(),
        );
    }
}